Update readme to add example for latex compiling

README.md

@@ -14,7 +14,7 @@ SpringBooTex will run as an REST service by default on port 10800;
 PDF's are generated by sending an HTTP POST request to the endpoint "/api/generate-pdf" with a JSON payload:
 ```
 {
-    "templateType": "LATEX | HTML",
+    "templateType": "LATEX | HTML", 
     "templateSourceType": "BASE64",
     "templateSource": "TEMPLATE_SOURCE",
     "stringMap": { KEY_VALUE_MAP },
@@ -26,7 +26,58 @@ PDF's are generated by sending an HTTP POST request to the endpoint "/api/genera
 
 #### Example: Generating a PDF from latex template
 
-https://github.com/shuhanmirza/SpringBooTex/blob/9527c95cc7a7d11a53784f0b2071b6f9c7fcc679/Doc/example.tex#L1-L10
+See our example LaTex template in [`Doc/example.tex`](https://github.com/shuhanmirza/SpringBooTex/blob/main/Doc/example.tex)
+
+You can see that, the variables are written between two `%` s.
+https://github.com/shuhanmirza/SpringBooTex/blob/49782f4cdd94a3e620f92739f7b37f381c3d77c0/Doc/example.tex#L12-21
+
+And the pdf has to embed an image named `universe.jpg`
+https://github.com/shuhanmirza/SpringBooTex/blob/49782f4cdd94a3e620f92739f7b37f381c3d77c0/Doc/example.tex#L37-38
+
+Let's prepare the JSON payload,
+
+Now, encode the latex template to base64 by running:
+```bash
+cat example.tex | base64
+```
+Which gives output:
+```
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
+```
+
+The JSON payload should look like this,
+```json
+{
+    "templateType": "LATEX",
+    "templateSourceType": "BASE64",
+    "templateSource": "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",
+    "stringMap": {
+        "FOOD": "Birun Vaat",
+        "CITY": "Sylhet",
+        "LIST_SIZE": "3"
+    },
+    "listMap" : {
+        "COUNTRY_LIST" : [
+            "Bangladesh",
+            "United States",
+            "United Kingdom"
+        ],
+        "CITY_LIST" : [
+            "Dhaka",
+            "Washington DC",
+            "London"
+        ]
+    },
+    "fileUrlMap": {
+        "universe.jpg": "https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Hubble_ultra_deep_field.jpg/1024px-Hubble_ultra_deep_field.jpg"
+    },
+    "responseType": "PDF"
+}
+```
+
+
+And the generated PDF is  
+![example-latex.pdf](Doc/example-latex.png)
 
 
 ## Contributing